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AccessControlListHandler.java
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AccessControlListHandler.java
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.undertow.server.handlers;
import io.undertow.UndertowMessages;
import io.undertow.attribute.ExchangeAttribute;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.StatusCodes;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
/**
* Handler that can accept or reject a request based on an attribute of the remote peer
*
* todo: should we support non-regex values for performance reasons?
* @author Stuart Douglas
* @author Andre Dietisheim
*/
public class AccessControlListHandler implements HttpHandler {
private volatile HttpHandler next;
private volatile boolean defaultAllow = false;
private final ExchangeAttribute attribute;
private final List<AclMatch> acl = new CopyOnWriteArrayList<>();
public AccessControlListHandler(final HttpHandler next, ExchangeAttribute attribute) {
this.next = next;
this.attribute = attribute;
}
public AccessControlListHandler(ExchangeAttribute attribute) {
this.attribute = attribute;
this.next = ResponseCodeHandler.HANDLE_404;
}
@Override
public void handleRequest(final HttpServerExchange exchange) throws Exception {
String attribute = this.attribute.readAttribute(exchange);
if (isAllowed(attribute)) {
next.handleRequest(exchange);
} else {
exchange.setResponseCode(StatusCodes.FORBIDDEN);
exchange.endExchange();
}
}
//package private for unit tests
boolean isAllowed(String attribute) {
if (attribute != null) {
for (AclMatch rule : acl) {
if (rule.matches(attribute)) {
return !rule.isDeny();
}
}
}
return defaultAllow;
}
public boolean isDefaultAllow() {
return defaultAllow;
}
public AccessControlListHandler setDefaultAllow(final boolean defaultAllow) {
this.defaultAllow = defaultAllow;
return this;
}
public HttpHandler getNext() {
return next;
}
public AccessControlListHandler setNext(final HttpHandler next) {
this.next = next;
return this;
}
/**
* Adds an allowed user agent peer to the ACL list
* <p/>
* User agent may be given as regex
*
* @param pattern The pattern to add to the ACL
*/
public AccessControlListHandler addAllow(final String pattern) {
return addRule(pattern, false);
}
/**
* Adds an denied user agent to the ACL list
* <p/>
* User agent may be given as regex
*
* @param pattern The user agent to add to the ACL
*/
public AccessControlListHandler addDeny(final String pattern) {
return addRule(pattern, true);
}
public AccessControlListHandler clearRules() {
this.acl.clear();
return this;
}
private AccessControlListHandler addRule(final String userAgent, final boolean deny) {
this.acl.add(new AclMatch(deny, userAgent));
return this;
}
static class AclMatch {
private final boolean deny;
private final Pattern pattern;
protected AclMatch(final boolean deny, final String pattern) {
this.deny = deny;
this.pattern = createPattern(pattern);
}
private Pattern createPattern(final String pattern) {
try {
return Pattern.compile(pattern);
} catch (PatternSyntaxException e) {
throw UndertowMessages.MESSAGES.notAValidRegularExpressionPattern(pattern);
}
}
boolean matches(final String attribute) {
return pattern.matcher(attribute).matches();
}
boolean isDeny() {
return deny;
}
@Override
public String toString() {
return getClass().getSimpleName()
+ "{"
+ "deny=" + deny
+ ", pattern='" + pattern + '\''
+ '}';
}
}
}